Young Blonde Girl In The Room With A Chair Posing At The Door

Doors also are applied in more specialized cases:
A trapdoor is a door that is oriented horizontally in a floor or ceiling, often accessed via a ladder.
Blast-proof doors are constructed to allow access to a structure but also to provide protection from the force of explosions.
A garden door is any door that opens to a garden or backyard. It is often used specifically for double French doors in place of a sliding glass door (also known as Patio doors). In such a configuration, it has the advantage of a very large opening for moving large objects in and out.